CN206422964U - A kind of circuit for eliminating displacement current in triaxial cable circuit - Google Patents
A kind of circuit for eliminating displacement current in triaxial cable circuit Download PDFInfo
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- CN206422964U CN206422964U CN201621464535.5U CN201621464535U CN206422964U CN 206422964 U CN206422964 U CN 206422964U CN 201621464535 U CN201621464535 U CN 201621464535U CN 206422964 U CN206422964 U CN 206422964U
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Abstract
The utility model belongs to Langmuir probe systems technology field, and in particular to the circuit of displacement current in a kind of elimination triaxial cable circuit.Circuit of the present utility model, including：Triaxial cable conductor cores, triaxial cable internal shield, triaxial cable external shielding layer, the first electric current observation probe, the second electric current observation probe and the 3rd electric current observation probe, Langmuir probe and power supply；The method precision that the utility model is solved in the prior art by later stage calculating deduction displacement current is low, and infeasible technical problem is in practice.Using circuit of the present utility model, eliminate during long cable transmission due to displacement current caused by distribution capacity, obtain the real current of load.Using Langmuir probe system, the electric current of real load is obtained, the volt-ampere characteristic curve of more accurately probe can be obtained, so as to calculate the plasma electron density near divertor target plate, electron temperature and ion flux.
Description
Technical field
The utility model belongs to Langmuir probe systems technology field, and in particular to one kind is eliminated in triaxial cable circuit
The circuit of displacement current.
Background technology
In ITER tokamak devices, Langmuir probe system is mainly used in measuring the plasma near divertor target plate
Electron density, electron temperature and ion flux.
During ITER Tokamak discharges, the gamma-rays of device near zone, radiation, stray magnetic field are appointed far above current
What tokamak.These specific conditions are designed with than large effect to electronic system, therefore by power supply and electronics system
System is placed in diagnosis hall, and distance has 200-300 meters.Probe power work is in alternating current-direct current both of which, probe current scope
Thousands of milliamperes are arrived for several milliamperes, the weight such as plasma electron temperature, density can be derived according to the VA characteristic curve of probe
Parameter is wanted, therefore the measurement of probe current is accurately extremely important.
In the insulator of signal-transmitting cable, because the presence of distribution capacity, the electric current of insulator is flowed through, except there is resistance
Property electric current also has capacity current, that is, displacement current, because caused by the discharge and recharge of electric capacity.
Due to the presence of displacement current so that not only include signal code, also displacement current in the electric current of measurement, and
Displacement current increases with the increase of power supply output frequency, and the electric current for directly contributing measurement is inaccurate, or even can not use.
At present, the method for eliminating displacement current in circuit is substantially to calculate deduction in the later stage, passes through given voltage sweep frequency
Rate, cable data calculate the size of displacement current, are then deducted from the electric current measured.This method theoretically can be with
Use, but actual use has many limitations, the parameter measurement of such as cable is inaccurate, given scan frequency, amplitude are not
Actual value, is inaccurate so by deducting the result calculated；Secondly, if voltage scanning is not the waveform of rule,
So computational methods are difficult to use；Further, since possible length is substantially different in use for cable, each cable is all
Demarcation is needed, such workload is very big, and use environment, it is also possible that the property of cable changes, these all can shadow
Ring the result calculated.
Utility model content
The utility model technical issues that need to address are：The side for deducting displacement current is calculated by the later stage in the prior art
Method precision is low, and infeasible in practice.
The technical solution of the utility model is as described below：
A kind of circuit for eliminating displacement current in triaxial cable circuit, including：Triaxial cable conductor cores, three coaxial electricals
Cable internal shield, triaxial cable external shielding layer, the first electric current observation probe, the second electric current observation probe and the observation of the 3rd electric current
Probe, Langmuir probe and power supply；
The one end for defining triaxial cable connection Langmuir probe is distal end, and the other end is near-end；Then three coaxial electrical
The distal end of cable conductor cores is connected after the first electric current observation probe, is connected to Langmuir probe, triaxial cable conductor cores, the first electricity
Stream observation probe and Langmuir probe three conducting；The Langmuir probe is used to measure the plasma near divertor target plate
Electron density, electron temperature and ion flux, the first electric current observation probe flow through size of current therein for detection；
The near-end of the triaxial cable conductor cores is connected after the second electric current observation probe, is connected to screen in triaxial cable
Cover the near-end of layer, triaxial cable conductor cores, the second electric current observation probe, triaxial cable internal shield three conducting；It is described
Second electric current observation probe is used to observe probe real current；Triaxial cable conductor cores and triaxial cable internal shield are formed
One similar open-loop antenna structure, and there is no voltage difference between triaxial cable conductor cores and triaxial cable internal shield,
So as to which displacement current can not be formed between the two；
The triaxial cable external shielding layer ground connection；
Between the 3rd electric current observation probe series connection and the near-end and power supply of triaxial cable conductor cores；3rd electric current is seen
Probing head is used for the total current for detecting power supply output, and power supply is used to drive Langmuir probe.
The beneficial effects of the utility model are：
Using circuit of the present utility model, eliminate during long cable transmission due to displacement electricity caused by distribution capacity
Stream, obtains the real current of load.Using Langmuir probe system, the electric current of real load (Langmuir probe) is obtained, can be with
The voltage-current characteristic curve of more accurately probe is obtained, so that the plasma electron calculated near divertor target plate is close
Degree, electron temperature and ion flux.
Brief description of the drawings
Fig. 1 is circuit diagram of the present utility model；
Wherein, 1- triaxial cables conductor cores, 2- triaxial cable internal shields, 3- triaxial cable external shielding layers, 4-
Langmuir probe, 5- power supplys, the electric currents of 6- first observation probe, the electric currents of 7- second observation probe, the electric currents of 8- the 3rd observation probe.
Embodiment
Face is entered to the circuit of displacement current in elimination triaxial cable circuit of the present utility model in conjunction with the accompanying drawings and embodiments
Row is described in detail.
A kind of circuit for eliminating displacement current in triaxial cable circuit of the present utility model, as shown in figure 1, including：Three
Coaxial cable conductor core 1, triaxial cable internal shield 2, triaxial cable external shielding layer 3, the first electric current observation probe 6, the
Two electric currents observation probe 7 and the 3rd electric current observation probe 8, Langmuir probe 4 and power supply 5.
The one end for defining triaxial cable connection Langmuir probe 4 is distal end, and the other end is near-end.Then three coaxial electrical
The distal ends of cable conductor cores 1 is connected after the first electric current observation probe 6, is connected to Langmuir probe 4, triaxial cable conductor cores 1, the
One electric current observation probe 6 and the three of Langmuir probe 4 conducting.The Langmuir probe 4 is used to measure near divertor target plate
Plasma electron density, electron temperature and ion flux, the first electric current observation probe 6 flow through therein for detection
Size of current.
The near-end of the triaxial cable conductor cores 1 is connected after the second electric current observation probe 7, is connected in triaxial cable
The near-end of screen layer 2, triaxial cable conductor cores 1, the second electric current observation probe 7, the three of triaxial cable internal shield 2 lead
It is logical.The second electric current observation probe 7 is used to observe probe real current.In triaxial cable conductor cores 1 and triaxial cable
The one similar open-loop antenna structure of formation of screen layer 2, and triaxial cable conductor cores 1 and triaxial cable internal shield 2 it
Between there is no voltage difference, so that displacement current can not be formed between the two.Second electric current observation probe 7 is placed in leading after above-mentioned connection
At body, therefore load real current can be obtained.
The triaxial cable external shielding layer 3 is grounded.
Between the series connection of 3rd electric current observation probe 8 and the near-end and power supply 5 of triaxial cable conductor cores 1.3rd electricity
Stream observation probe 8 is used for the total current for detecting that power supply 5 is exported, and power supply 5 is used to drive Langmuir probe 4.
Claims (1)
1. a kind of circuit for eliminating displacement current in triaxial cable circuit, including：It is triaxial cable conductor cores (1), three coaxial
Cable internal shield (2), triaxial cable external shielding layer (3), the first electric current observation probe (6), the second electric current observation probe (7)
With the 3rd electric current observation probe (8), Langmuir probe (4) and power supply (5)；It is characterized in that：
It is distal end to define one end of triaxial cable connection Langmuir probe (4), and the other end is near-end；The then triaxial cable
The distal end of conductor cores (1) is connected after the first electric current observation probe (6), is connected to Langmuir probe (4), triaxial cable conductor cores
(1), the first electric current observation probe (6) and Langmuir probe (4) three conducting；The Langmuir probe (4) is used to measure inclined filter
Plasma electron density, electron temperature and ion flux near device target plate, the first electric current observation probe (6) are used for
Size of current therein is flowed through in detection；
The near-end of the triaxial cable conductor cores (1) is connected after the second electric current observation probe (7), is connected in triaxial cable
The near-end of screen layer (2), triaxial cable conductor cores (1), the second electric current observation probe (7), triaxial cable internal shield (2)
Three turns on；The second electric current observation probe (7) is used to observe probe real current；Triaxial cable conductor cores (1) and three
Coaxial cable internal shield (2) one similar open-loop antenna structure of formation, and triaxial cable conductor cores (1) and three coaxial electricals
Cable internal shield does not have voltage difference between (2), so as to can not form displacement current between the two；
Triaxial cable external shielding layer (3) ground connection；
Between 3rd electric current observation probe (8) series connection and the near-end and power supply (5) of triaxial cable conductor cores (1)；3rd
Electric current observation probe (8) is used for the total current for detecting power supply (5) output, and power supply (5) is used to drive Langmuir probe (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621464535.5U CN206422964U (en) | 2016-12-29 | 2016-12-29 | A kind of circuit for eliminating displacement current in triaxial cable circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621464535.5U CN206422964U (en) | 2016-12-29 | 2016-12-29 | A kind of circuit for eliminating displacement current in triaxial cable circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206422964U true CN206422964U (en) | 2017-08-18 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621464535.5U Active CN206422964U (en) | 2016-12-29 | 2016-12-29 | A kind of circuit for eliminating displacement current in triaxial cable circuit |
Country Status (1)
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| CN (1) | CN206422964U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111426262A (en) * | 2020-05-14 | 2020-07-17 | 中国航发湖南动力机械研究所 | High-temperature blade tip clearance sensor |
-
2016
- 2016-12-29 CN CN201621464535.5U patent/CN206422964U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111426262A (en) * | 2020-05-14 | 2020-07-17 | 中国航发湖南动力机械研究所 | High-temperature blade tip clearance sensor |
| CN111426262B (en) * | 2020-05-14 | 2021-11-12 | 中国航发湖南动力机械研究所 | High-temperature blade tip clearance sensor |
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